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- W1519247927 abstract "Presumptive evidence suggests that the brown fat mitochondrial uncoupling protein, thermogenin, is involved in the mechanism of stimulation of respiration by norepinephrine in the intact tissue. Conflicting data have been reported which suggest involvement of either adenine nucleotides, or fatty acids, or long chain acyl-CoA, or protons in the physiological regulation. We measured the electrical potential gradient across the mitochondrial membrane (delta psi m) in control cells and in cells stimulated with norepinephrine, using the accumulation of lipophilic cation, tetraphenylphosphonium, as an indicator of the potential gradient. The value of delta psi m in the cells in the control state is 116 mV, and in the hormonally stimulated state it is 56.6 mV. This supports the view that the protein is involved in the mechanism of hormone action. Other studies were designed to distinguish between the effects of fatty acids and ATP levels on the uncoupling protein in isolated mitochondria and in the adipocytes. ATP levels and fatty acid levels inside intact cells were independently varied using oligomycin or external fatty acids. Their effect on thermogenin was monitored as the capacity of the cells for reverse electron transport from durohydroquinone. The results suggest that ATP modulates the activity of thermogenin, while fatty acids can alter the relationship between ATP and thermogenin activity such that the protein appears to be activated at a higher cellular ATP level in the presence of fatty acids than in their absence." @default.
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- W1519247927 date "1986-01-01" @default.
- W1519247927 modified "2023-09-27" @default.
- W1519247927 title "Regulation of the uncoupling protein in brown adipose tissue." @default.
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- W1519247927 doi "https://doi.org/10.1016/s0021-9258(17)42469-0" @default.
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